Pick out the wrong statement.:
Pick out the wrong statement.:
Which is the heaviest fuel gas out of the following?
Which is the heaviest fuel gas out of the following?
Which of the following is not a by-product fuel?
Which of the following is not a by-product fuel?
A coal containing high amount of volatile matter will have
A coal containing high amount of volatile matter will have
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.
A coal that softens and fuses on heating is
A coal that softens and fuses on heating is
A coal having higher volatile matter content, has lower
A coal having higher volatile matter content, has lower
Coke ovens in steel plant are heated by
Coke ovens in steel plant are heated by
Dry air required to burn 1 kg of carbon completely may be around __________ kg.
Dry air required to burn 1 kg of carbon completely may be around __________ kg.
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
Volumetric ratio of N₂ to O₂ in dry atmospheric air is
Volumetric ratio of N₂ to O₂ in dry atmospheric air is
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
Orsat apparatus
Orsat apparatus
Washing of coal
Washing of coal
Presence of nitrogen in combustion air does not reduce the
Presence of nitrogen in combustion air does not reduce the
Which of the following is a poisonous fuel gas?
Which of the following is a poisonous fuel gas?
Washing of coal decreases its
Washing of coal decreases its
Insitu theory and drift theory are related to the
Insitu theory and drift theory are related to the
Which of the following fuels is the best for burning on chain grate stoker?
Which of the following fuels is the best for burning on chain grate stoker?
'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.
'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.
With increase in the oxygen content of the coal, its __________ decreases.
With increase in the oxygen content of the coal, its __________ decreases.
Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.
Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300° ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air.
Which of the following would require least amount of secondary air for combustion?
Which of the following would require least amount of secondary air for combustion?
Narrow coke ovens as compared to wider coke ovens
Narrow coke ovens as compared to wider coke ovens
Softening temperature of coal ash is a measure of the __________ of coal.
Softening temperature of coal ash is a measure of the __________ of coal.
Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.
Light oil whose major component is benzol, is obtained by the distillation of crude tar in the temperature range of __________ °C.
The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.
The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?
Purity of coke means that, it is high in carbon and low in
Purity of coke means that, it is high in carbon and low in
By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of
By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of
Which of the following coal gasification processes will produce gas having maximum methane content?
Which of the following coal gasification processes will produce gas having maximum methane content?
Which of the following petrographic constituents of coal is non-coking?
Which of the following petrographic constituents of coal is non-coking?
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the
In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the
Gross calorific value will be equal to the net calorific value for
Gross calorific value will be equal to the net calorific value for
When the coal is heated in absence of air, it is called its
When the coal is heated in absence of air, it is called its
Combustion of pulverised coal compared to the lumpy coal
Combustion of pulverised coal compared to the lumpy coal
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about
Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about
During combustion of gaseous fuels, deficiency of air
During combustion of gaseous fuels, deficiency of air
During its calorific value determination by bomb calorimeter, coal is combusted by
During its calorific value determination by bomb calorimeter, coal is combusted by
Ultimate analysis of coal determines its __________ content.
Ultimate analysis of coal determines its __________ content.
Presence of phosphorous in metallurgical coal
Presence of phosphorous in metallurgical coal
Air/gas ratio for complete combustion will be the highest for
Air/gas ratio for complete combustion will be the highest for
Producer gas containing least amount of tar is produced by the
Producer gas containing least amount of tar is produced by the
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be
Bunsen burner is an example of a/an __________ burner.
Bunsen burner is an example of a/an __________ burner.
Short/intense flame is produced during combustion of gaseous fuel by using
Short/intense flame is produced during combustion of gaseous fuel by using
Which of the following is not a by-product fuel?
Which of the following is not a by-product fuel?
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the
Out of the following, which is the most important parameter for the blast furnace grade coke?
Out of the following, which is the most important parameter for the blast furnace grade coke?
Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.
Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.
Atomising steam to fuel oil ratio in a burner should be around
Atomising steam to fuel oil ratio in a burner should be around
A gaseous fuel in order to develop luminousity on burning, must contain
A gaseous fuel in order to develop luminousity on burning, must contain
Pick the odd man out.
Pick the odd man out.
One kg of carbon for theoretically complete combustion requires __________ kg of air.
One kg of carbon for theoretically complete combustion requires __________ kg of air.
Washing of coal
Washing of coal
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?
Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?
Which of the following is a single stage, fixed bed high pressure coal gasification process?
Which of the following is a single stage, fixed bed high pressure coal gasification process?
Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?
Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?
The function of secondary combustion air is to
The function of secondary combustion air is to
Producer gas comprises mainly of
Producer gas comprises mainly of
Removal of hydrogen from coke oven gas
Removal of hydrogen from coke oven gas
Carbon Content by weight in air dried wood may be about __________ percent.
Carbon Content by weight in air dried wood may be about __________ percent.
Volatile matter content in coking coal may be about __________ percent.
Volatile matter content in coking coal may be about __________ percent.
During the carbonisation of coal
During the carbonisation of coal
Lurgi coal gasifier is a pressurised __________ bed reactor.
Lurgi coal gasifier is a pressurised __________ bed reactor.
Which of the following has the highest flame velocity?
Which of the following has the highest flame velocity?
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.
Soft coke is not
Soft coke is not
Caking index of coal blend used for blast furnace coke making is about
Caking index of coal blend used for blast furnace coke making is about
If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as
If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as
Combustion reaction of fuels is a/an __________ reaction.
Combustion reaction of fuels is a/an __________ reaction.
Which of the following is used for making the explosive 'TNT'?
Which of the following is used for making the explosive 'TNT'?
A fuel with high heat release rate will
A fuel with high heat release rate will
Gobar gas constitutes mainly of
Gobar gas constitutes mainly of
Coke oven gas constitutes mainly of
Coke oven gas constitutes mainly of
A coal having higher volatile matter content will necessarily have lower
A coal having higher volatile matter content will necessarily have lower
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
Main component of sewage gas produced during aneorobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
Orsat apparatus is meant for
Orsat apparatus is meant for
Efficiency of the combustion of a fuel is judged by the __________ the flue gas.
Efficiency of the combustion of a fuel is judged by the __________ the flue gas.
Which of the following is not a micro component present in coal?
Which of the following is not a micro component present in coal?
Width of the coke oven towards coke side is slightly more than that on pusher side to
Width of the coke oven towards coke side is slightly more than that on pusher side to
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher
The difference between total carbon and fixed carbon of coal will be minimum in case of
The difference between total carbon and fixed carbon of coal will be minimum in case of
Which of the following is the maximum coal producing state in India?
Which of the following is the maximum coal producing state in India?
Critical Air Blast (CAB) value of coke is a direct measure of its
Critical Air Blast (CAB) value of coke is a direct measure of its
Proximate analysis of coal determines its __________ content.
Proximate analysis of coal determines its __________ content.
Moisture loss is determined by the
Moisture loss is determined by the
In flue gas analysis by Orsat's apparatus, oxygen is absorbed by
In flue gas analysis by Orsat's apparatus, oxygen is absorbed by
Ionisation potential applied across the electrodes of electrostatic tar precipitator is around
Ionisation potential applied across the electrodes of electrostatic tar precipitator is around
Calorific value of tar is about __________ Kcal/kg.
Calorific value of tar is about __________ Kcal/kg.
Stack (chimney) height in a big thermal power plant is dictated by the
Stack (chimney) height in a big thermal power plant is dictated by the
Undercharging of coal in the by-product coke ovens results in
Undercharging of coal in the by-product coke ovens results in
Coals used for the generation of producer gas should have
Coals used for the generation of producer gas should have
Flue gas from the heating chamber of byproduct coke ovens is removed by
Flue gas from the heating chamber of byproduct coke ovens is removed by
The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
__________ has the widest inflammability limit (explosion limit) of all the gases.
__________ has the widest inflammability limit (explosion limit) of all the gases.
The gasification reaction represented by, C + H₂O = CO + H₂, is
The gasification reaction represented by, C + H₂O = CO + H₂, is
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be
Which of the following has the highest calorific value (kcal/Nm³) ?
Which of the following has the highest calorific value (kcal/Nm³) ?
Gobar gas is produced by the __________ of cown dung.
Gobar gas is produced by the __________ of cown dung.
Coke having higher porosity has
Coke having higher porosity has
Power alcohol as compared to straight run gasoline has lower
Power alcohol as compared to straight run gasoline has lower
Sulphur in metallurgical coal
Sulphur in metallurgical coal
Higher percentage of ash in coal meant for the production of metallurgical grade coke
Higher percentage of ash in coal meant for the production of metallurgical grade coke
Main constituent of the gas produced from a gobar gas plant is
Main constituent of the gas produced from a gobar gas plant is
Junker's calorimeter is used to determine the calorific value of
Junker's calorimeter is used to determine the calorific value of
Use of pulverised coal in boiler furnace provides
Use of pulverised coal in boiler furnace provides
Naphthalene recovered from coke oven gas is used
Naphthalene recovered from coke oven gas is used
The weathering index of a coal
The weathering index of a coal
Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the
Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the
The catalyst used in shift converter is
The catalyst used in shift converter is
Presence of force moisture in coal is most disadvantageous during its
Presence of force moisture in coal is most disadvantageous during its
Main use of hard coke produced by high temperature carbonisation is in the
Main use of hard coke produced by high temperature carbonisation is in the
With increases in carbonisation temperature
With increases in carbonisation temperature
The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called
The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.
Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the __________ of coal.
'Fat coals' are those coals which have very high
'Fat coals' are those coals which have very high
KOH solution used in orsat apparatus absorbs
KOH solution used in orsat apparatus absorbs
In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing
In Orsat's apparatus, ammoniacal cuprous chloride is used for selectivity absorbing
Largest constituent of coke oven gas is
Largest constituent of coke oven gas is
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.
Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in
Nitrogen present in the flue gas is determined in the orsat apparatus by absorbing it in
A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that
A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that
The fuel ratio of a coal is
The fuel ratio of a coal is
Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
Bomb calorimeter is used for the determination of calorific value of the __________ fuels.
Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.
With increase in calorific value of fuels, their adiabatic flame temperatures
With increase in calorific value of fuels, their adiabatic flame temperatures
The hottest part of the flame lies in its____zone.
The hottest part of the flame lies in its____zone.
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
Which of the following gaseous fuels has the lowest calorific value?
Which of the following gaseous fuels has the lowest calorific value?
In low temperature carbonisation of coal, the
In low temperature carbonisation of coal, the
